NEET Zoology Chapter Weightage & Important Topics 2027
Every chapter ranked by how many questions it contributed across 4 past NEET Paper-1 shift papers (2022–2025), with the expected number of questions in a 45-question Zoology section. Focus your prep top-down.
Chapter-wise weightage
| # | Chapter | Expected in paper | Weightage |
|---|---|---|---|
| 1 | Structural Organisation in Animals | ~3.3 | ★★★★★ |
| 2 | Human Health and Disease | ~3.1 | ★★★★★ |
| 3 | Animal Kingdom | ~3.1 | ★★★★★ |
| 4 | Human Reproduction | ~3.1 | ★★★★★ |
| 5 | Molecular Basis of Inheritance | ~2.8 | ★★★★☆ |
| 6 | Chemical Coordination and Integration | ~2.4 | ★★★★☆ |
| 7 | Biotechnology: Principles and Processes | ~2.1 | ★★★☆☆ |
| 8 | Biomolecules | ~1.9 | ★★★☆☆ |
| 9 | Principles of Inheritance and Variation | ~1.9 | ★★★☆☆ |
| 10 | Evolution | ~1.9 | ★★★☆☆ |
| 11 | Reproductive Health | ~1.9 | ★★★☆☆ |
| 12 | Cell Cycle and Cell Division | ~1.7 | ★★★☆☆ |
| 13 | Organisms and Populations | ~1.4 | ★★☆☆☆ |
| 14 | Cell: The Unit of Life | ~1.4 | ★★☆☆☆ |
| 15 | Body Fluids and Circulation | ~1.4 | ★★☆☆☆ |
| 16 | Biotechnology and its Applications | ~1.2 | ★★☆☆☆ |
| 17 | Neural Control and Coordination | ~1.2 | ★★☆☆☆ |
| 18 | Excretory Products and their Elimination | ~1.2 | ★★☆☆☆ |
| 19 | Breathing and Exchange of Gases | ~1.2 | ★★☆☆☆ |
| 20 | Locomotion and Movement | ~1.2 | ★★☆☆☆ |
| 21 | Plant Kingdom | ~0.7 | ★☆☆☆☆ |
| 22 | Digestion and Absorption | ~0.9 | ★☆☆☆☆ |
| 23 | Ecosystem | ~0.7 | ★☆☆☆☆ |
| 24 | Morphology of Flowering Plants | ~0.5 | ★☆☆☆☆ |
| 25 | Sexual Reproduction in Flowering Plants | ~0.5 | ★☆☆☆☆ |
| 26 | Biological Classification | ~0.7 | ★☆☆☆☆ |
| 27 | Biodiversity and Conservation | ~0.5 | ★☆☆☆☆ |
| 28 | Microbes in Human Welfare | ~0.5 | ★☆☆☆☆ |
| 29 | Photosynthesis in Higher Plants | ~0.2 | ★☆☆☆☆ |
| 30 | Plant Growth and Development | ~0.2 | ★☆☆☆☆ |
| 31 | The Living World | ~0.2 | ★☆☆☆☆ |
Top 20 most-asked topics
| # | Topic | Chapter | Times asked | Importance |
|---|---|---|---|---|
| 1 | Chordata vs Vertebrata; notochord replaced by vertebral column | Animal Kingdom | 2× | ★★★★★ |
| 2 | Gel electrophoresis; elution of DNA fragments; separation by size | Biotechnology: Principles and Processes | 1× | ★★★☆☆ |
| 3 | Nucleoside vs nucleotide vs nitrogen base; amino acid | Biomolecules | 1× | ★★★☆☆ |
| 4 | Gametogenesis timing; oogenesis vs spermatogenesis; polar body; LH surge | Human Reproduction | 1× | ★★★☆☆ |
| 5 | Class Cyclostomata characteristics (ectoparasites on fishes) | Animal Kingdom | 1× | ★★★☆☆ |
| 6 | Golgi apparatus function; cis and trans faces; vesicular trafficking | Cell: The Unit of Life | 1× | ★★★☆☆ |
| 7 | Seed structure; scutellum; albuminous/non-albuminous seeds; perisperm | Morphology of Flowering Plants | 1× | ★★★☆☆ |
| 8 | Antibody structure (H2L2); antigen binding site; constant region | Human Health and Disease | 1× | ★★★☆☆ |
| 9 | RNA interference; gene silencing by complementary dsRNA | Biotechnology and its Applications | 1× | ★★★☆☆ |
| 10 | Dihybrid cross; law of independent assortment; F2 phenotypic ratio | Principles of Inheritance and Variation | 1× | ★★★☆☆ |
| 11 | Histones rich in basic amino acids lysine and arginine | Molecular Basis of Inheritance | 1× | ★★★☆☆ |
| 12 | Menarche - onset of first menstruation | Human Reproduction | 1× | ★★★☆☆ |
| 13 | Hormones of non-endocrine tissues (ANF, erythropoietin, secretin, aldosterone) | Chemical Coordination and Integration | 1× | ★★★☆☆ |
| 14 | Apoenzyme (protein part) vs cofactor/coenzyme/prosthetic group | Biomolecules | 1× | ★★★☆☆ |
| 15 | Units of productivity (energy per area per time) | Ecosystem | 1× | ★★★☆☆ |
| 16 | Analogous organs and convergent evolution (sweet potato root vs potato stem) | Evolution | 1× | ★★★☆☆ |
| 17 | Pedigree analysis; carrier probability of autosomal recessive trait | Principles of Inheritance and Variation | 1× | ★★★☆☆ |
| 18 | Tapetum - nourishment of microspore mother cells; anther structure | Sexual Reproduction in Flowering Plants | 1× | ★★★☆☆ |
| 19 | Megasporogenesis and female gametophyte (embryo sac) development | Sexual Reproduction in Flowering Plants | 1× | ★★★☆☆ |
| 20 | Floral symmetry - zygomorphic flower (pea) | Morphology of Flowering Plants | 1× | ★★★☆☆ |
Weightage = recency-weighted question count (recent shifts count for more). "Expected/paper" projects each chapter's share onto a 45-question section — a planning guide, not a guarantee.